03 Yz 450f

tpastrana

My bike seems like it runs way lean (backfires, and pops) when the hot start lever is in but when i pull it out it seems like its runnin fine, ive torn the carb apart two times and wondering if i missed cleaning a place any help is appreciated!

grayracer513

The problem with the pilot jet is that the metering orifice is so small that any little bit of dried fuel varnish will cut the jet size by 3 or 4 steps even though it looks like it's open. The cross holes can also become clogged and are often overlooked.